I have a 93R17-FV with a 3.5-10 x 36mm with AO. Weaver mediums would NOT clear the barell as I found out the hard way. I now have that scope in high rings. I then bought a 6-16 x 40 Tasco for my MKII-FV which has the same barell profile, and "cleverly" bought the high rings along with it. Much to my dismay, that baaaaaaaaaarely wouldnt clear the scope, and I wound up using extra high rings. So be very careful as these rings are not cheap. The weaver high rings say right on the package "good up to 40mm" but the heavy barell and the AO made it too low to work with even a 36mm scope. There are also other manufacturers other than weaver whos rings may have different dimensions just to add to the confusion.